Method and Apparatus for Zone Selection in Area Monitoring Devices

• US 20090322549A1
• Filed: 05/07/2009
• Published: 12/31/2009
• Est. Priority Date: 05/09/2008
• Status: Active Grant

• Current Assignee: Sandra Ruiz
• Original Assignee: Omron Scientific Technologies Incorporated (Omron Corporation)
• Inventors: Drinkard, John, Schleifer, Fred, Sanchez, Alejandro Ruiz, Dums, Christopher Alan
• Granted Patent: US 8,018,353 B2
• Time in Patent Office: Days
• US Class Current: 340/1.1
• CPC Class Codes: G01V 8/20 using multiple transmitters or receivers
• CPC Class Codes: G05B 19/4061 Avoiding collision or forbidden zones

Abstract

Zone selection logic in an area monitoring device increases the number of unique monitoring zone selections that can be selected using a limited number of discrete zone selection inputs, without compromising the safety critical operation of zone selection. The device monitors the logical state of each input in a set of individual inputs and recognizes each unique logical combination of zone selection inputs as a different zone selection. For example, each of two or more configured monitoring zones is associated with a different combinatorial zone selection pattern of asserted zone selection input signals. Correspondingly, a control circuit within the area monitoring device is configured to monitor the discrete zone selection inputs and activate a given one of the configured monitoring zones based on recognizing the associated combinatorial zone selection pattern of asserted zone selection signals.

Claims

1. An area monitoring device comprising:

a set of discrete zone selection inputs configured to receive zone selection input signals;

a detection system configured to monitor an activated one of two or more configured monitoring zones, each monitoring zone associated with a different combinatorial zone selection pattern of asserted zone selection input signals;

a control circuit configured to monitor the discrete zone selection inputs and activate a given one of the configured monitoring zones based on recognizing the associated combinatorial zone selection pattern of asserted zone selection signals.

2. The area monitoring device of claim 1, wherein the number of combinatorial zone selection patterns recognizable by the control circuit is given by the binomial coefficient

3. The area monitoring device of claim 2, wherein there are m zone selection inputs in the set of discrete zone selection inputs, and wherein the control circuit is configured to use a configurable value as the number n of zone selection inputs that are configured for use in zone selection.

4. The area monitoring device of claim 1, wherein the area monitoring device further comprises a configuration interface, and wherein the area monitoring device is configured to receive zone configuration and selection information through the configuration interface, for configuring monitoring zones and their associated combinatorial zone selection patterns.

5. The area monitoring device of claim 4, further comprising a memory configured to store the zone configuration and selection information.

6. The area monitoring device of claim 1, wherein the area monitoring device further comprises interface and control logic configured to permit in situ configuration of monitoring zones and their associated combinatorial zone selection patterns.

7. The area monitoring device of claim 1, wherein the control circuit is configured to dynamically change the configured monitoring zone that is activated for monitoring by the detection system in response to recognizing dynamically changing combinatorial zone selection patterns in the zone selection input signals applied to the zone selection inputs.

8. The area monitoring device of claim 1, wherein the control circuit is configured to operate with a configured delay time that establishes a time within which the zone selection inputs must switch states from one valid combinatorial zone selection pattern to another valid combinatorial zone selection pattern.

9. The area monitoring device of claim 1, wherein the area monitoring device comprises an optoelectronic monitoring system.

10. The area monitoring device of claim 9, wherein the optoelectronic monitoring system comprises a laser scanner.

11. The area monitoring device of claim 9, wherein the optoelectronic monitoring system comprises an imaging device.

12. The area monitoring device of claim 1, wherein the area monitoring device comprises part of an autonomous guided vehicle system.

13. A method in an area monitoring device of activating different monitoring zones for monitoring by the area monitoring device, the method comprising:

monitoring zone selection input signals applied to zone selection inputs of the area monitoring device;

associating each of two or more configured monitoring zones with a different combinatorial zone selection pattern of asserted zone selection input signals;

activating a given one of the configured monitoring zones based on recognizing that a combinatorial pattern of asserted ones of the zone selection input signals matches the associated combinatorial zone selection pattern.

14. The method of claim 13, wherein the number of recognizable combinatorial zone selection patterns is given by the binomial coefficient

15. The method of claim 14, further comprising configuring r to be less than or equal to n−

1.

16. The method of claim 14, further comprising using a configurable value as the number n of m zone selection inputs that are configured for use in zone selection.

17. The method of claim 13, further comprising configuring monitoring zones and their associated combinatorial zone selection patterns based on receiving zone configuration and selection information from an external computer system.

18. The method of claim 17, further comprising storing the zone configuration and selection information in a memory of the area monitoring device.

19. The method of claim 13, further comprising configuring monitoring zones and their associated combinatorial zone selection patterns based on receiving zone configuration and selection information based on input received through an interface of the area monitoring device.

20. The method of claim 13, further comprising dynamically changing the configured monitoring zone that is activated for monitoring by the area monitoring device in response to recognizing dynamically changing combinatorial zone selection patterns in the zone selection input signals applied to the zone selection inputs.